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President Donald Trump thanked Walter Reed National Military Medical Center staff and even cracked a joke about his age as he fights COVID-19.

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President Donald Trump’s battle with COVID-19 will come to a critical turning point in the next few days as the disease tests his immune system.

Saturday,  White House physician Sean Conley said the illness is entering “phase 2.”

In a video statement released Saturday evening from Walter Reed National Military Medical Center, Trump said, “I’m starting to feel good. You don’t know over the next period of a few days, I guess that’s the real test, so we’ll be seeing what happens over those next couple of days.”

Several days after symptoms of COVID-19 appear, the body’s immune system must make an important switch to fight the virus with precision – or possibly face life-threatening consequences.

Watch: Dr. Sean Conley did not answer